Background
A mid-sized law firm with over 200 staff across multiple offices had made the decision to roll out Microsoft Copilot as part of a broader Microsoft 365 modernization initiative. Leadership saw significant productivity potential, faster document drafting, summarization of case files, and streamlined internal communications. However, the firm’s IT team had limited experience governing AI tools at scale, and the compliance team had serious concerns about how Copilot would interact with sensitive client matter files.
Challenge
The firm’s greatest concern was data exposure. Microsoft Copilot draws on content across a user’s Microsoft 365 environment, including SharePoint, Teams, and email, meaning poorly configured permissions could allow Copilot to surface confidential client documents to the wrong people. With solicitor-client privilege on the line, the firm could not afford a misstep. They also lacked a formal AI acceptable use policy and had no process for monitoring how employees were interacting with Copilot post-deployment.
Action
Armour Cybersecurity was engaged prior to any deployment activity. The team began with a full Microsoft 365 permissions audit, identifying overly broad access rights and misconfigured SharePoint sites that would have created immediate risk once Copilot was enabled. Armour Cybersecurity then designed a phased rollout plan, beginning with a controlled pilot across a non-sensitive department, while developing a tailored AI governance framework that included an acceptable use policy, a data classification model, and a Copilot-specific risk register. Staff training was delivered across all seniority levels, with specialized sessions for partners and practice leads.
Impact
- Identified and remediated 47 permission-related vulnerabilities before Copilot went live
- Achieved full firm-wide deployment within 90 days, on schedule and without incident
- Established an AI governance policy adopted across all departments
- Reduced time spent on document summarization by an estimated 30% within the first month of deployment
- Zero compliance incidents reported in the six months following launch
Conclusion
By engaging Armour Cybersecurity before deployment rather than after, the firm was able to realize the full productivity benefits of Microsoft Copilot without exposing client data or breaching its professional obligations. The governance framework developed during this engagement has since become the foundation of the firm’s broader AI strategy.
